| 摘要 |
PROBLEM TO BE SOLVED: To achieve commonality of circuit parts on speech reproduction of navigation system and sufficiently demonstrate the original function of route guidance, even after becoming common. SOLUTION: In the case that the route guidance is not required, a processing control part 140 for sequentially and additionally writing a digital speech signal from an audio source receiver 110 in an FIFO memory 150 for speech and updates an address on the added side. In the case that the route guidance is required, the processing control part 140 creates a digital speech signal, corresponding to a speech message for guidance for the route guidance, overwrites the FIFO memory 150 for speech, and replaces the previously stored digital speech signal from the receiver 110 with it. a DSP 160 sequentially reads the digital speech signal from the FIFO memory 150 for speech and outputs to a loudspeaker 170 a speech signal in analog form obtained, by decoding and converting the read digital speech signal into analog form from digital form. |
